Mathematics
Senior High

2n乗-3から2n乗-4になる過程を教えてください
お願いします

nし3(2 n(n-1)(n-2).2n-3.a"-36° 3! よって, a"-°bがの係数は 20-8 -2-3=_2(n-1)(n-2).9n{0 3! 3-2 3

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